Far more satisfying than the Selected Writings (which leaves out so much innovative work), and a better, corrected version of texts in the Yale edition, with some delightful additions and substitutions (e.g. the erotic 'Pink Melon Joy' for 'Lifting Belly'). THIS is the one Stein book you'll need to ground yourself with before you start abounding in the individual texts.
I read parts of this while taking a class on Gertrude Stein. The class combined reading her writings and writing from the readings based on exercises given. She was not easy for me to read, so it was good to have structure. I found her writing opened doors to explore my own work, which would be inaccessible if not for the meld evoked by the class.